NormOne.cpp

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00001 /*
00002  * This program is free software; you can redistribute it and/or modify
00003  * it under the terms of the GNU General Public License as published by
00004  * the Free Software Foundation; either version 3 of the License, or
00005  * (at your option) any later version.
00006  *
00007  * Written (W) 1999-2009 Soeren Sonnenburg
00008  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
00009  */
00010 
00011 #include <shogun/preprocessor/NormOne.h>
00012 #include <shogun/preprocessor/SimplePreprocessor.h>
00013 #include <shogun/mathematics/Math.h>
00014 #include <shogun/features/Features.h>
00015 #include <shogun/features/SimpleFeatures.h>
00016 
00017 using namespace shogun;
00018 
00019 CNormOne::CNormOne()
00020 : CSimplePreprocessor<float64_t>()
00021 {
00022 }
00023 
00024 CNormOne::~CNormOne()
00025 {
00026 }
00027 
00029 bool CNormOne::init(CFeatures* features)
00030 {
00031     ASSERT(features->get_feature_class()==C_SIMPLE);
00032     ASSERT(features->get_feature_type()==F_DREAL);
00033 
00034     return true;
00035 }
00036 
00038 void CNormOne::cleanup()
00039 {
00040 }
00041 
00043 bool CNormOne::load(FILE* f)
00044 {
00045     SG_SET_LOCALE_C;
00046     SG_RESET_LOCALE;
00047     return false;
00048 }
00049 
00051 bool CNormOne::save(FILE* f)
00052 {
00053     SG_SET_LOCALE_C;
00054     SG_RESET_LOCALE;
00055     return false;
00056 }
00057 
00061 SGMatrix<float64_t> CNormOne::apply_to_feature_matrix(CFeatures* features)
00062 {
00063     SGMatrix<float64_t> feature_matrix=((CSimpleFeatures<float64_t>*)features)->get_feature_matrix();
00064 
00065     for (int32_t i=0; i<feature_matrix.num_cols; i++)
00066     {
00067         float64_t* vec= &(feature_matrix.matrix[i*feature_matrix.num_rows]);
00068         float64_t norm=CMath::sqrt(CMath::dot(vec, vec, feature_matrix.num_rows));
00069         CMath::scale_vector(1.0/norm, vec, feature_matrix.num_rows);
00070     }
00071     return feature_matrix;
00072 }
00073 
00076 SGVector<float64_t> CNormOne::apply_to_feature_vector(SGVector<float64_t> vector)
00077 {
00078     float64_t* normed_vec = SG_MALLOC(float64_t, vector.vlen);
00079     float64_t norm=CMath::sqrt(CMath::dot(vector.vector, vector.vector, vector.vlen));
00080 
00081     for (int32_t i=0; i<vector.vlen; i++)
00082         normed_vec[i]=vector.vector[i]/norm;
00083 
00084     return SGVector<float64_t>(normed_vec,vector.vlen);
00085 }
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